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1.
SOFTWAREEVOLUTIONSoftwareevolutionhasbeenaddressedfrommanyviewpoints .Theseincludemanagementis suessuchaswhichpartsofasystemshouldberebuilt,configurationissuessuchaskeepingtrackofmanyversionsofthesamesystem ,test ingissuessuchasdeterminingwhichtestcases…  相似文献   

2.
INTRODUCTIONManyexperimentalandnumericalstudieshavebeencompletedtoinvestigatetheparticlemotioninturbulence .Previousfluiddynamicsstudieswerecommonlybasedontime averagedReynoldsequations,suchasthetwo equationmodel.Justlikethecarriergasphase,theparti cleph…  相似文献   

3.
1 Introduction Withthedevelopmentofthe powerelectronicstechnology ,stationarypowerconvertingdevicessuchasAC DCconvertersandDC ACinvertersareappliedinvariousindustrialareas .However ,thishasledtosomeproblems ,e .g .theincreaseofharmonicsinpowersupply ,andtheEM…  相似文献   

4.
Colourwordsarewordsusedtodescribethecoloursofdifferentthings.Besidesindicatingtheirspecificcolours,suchasred ,yellow ,blackandwhite ,theyalsoreflectthedifferentculturalconnota tionsindifferentlanguages.Forexample,Chinesegirlslikewearingreddressesontheirwe…  相似文献   

5.
1 Introduction Theadaptivefuzzycontrolisasuccesfulissueofthefuzzycontrol.Theadaptivefuzzycontrolofonlinelearningandonlinecontrolistheorientationofthedevelopmentintheadaptivefuzzycontrolfield.Butthecomplexoftheplantsuchasstrongcoupledrelations,long…  相似文献   

6.
1 Introduction Thesuccessfulcommericalapplicationsofwirelesstechnologydemandappropriateantennas.Typically,adualpolarizationoperationsuchassimultaneousvertialandhorizontalpolarizationantennawithlowprofile,smallsize,andlightweightisrequiredforwidespre…  相似文献   

7.
INTRODUCTIONThesericultureecosystemoftheHang Jia HudistrictinZhejiangProvincehasbeenseri ouslypollutedbyfluoridesince 1 982 .Widelydistributedsilicateindustries,suchasbrick ,ce ramic ,fireproofmaterial,andcementprocessingindustrieswhichmaketheirproductsusingv…  相似文献   

8.
INTRODUCTIONManydatabaseapplications,suchastelecommunicationsindustry ,factoryautoma tion ,requirehighperformanceandreal timeac cesstodata .DRDBs(DiskResidentDatabase) ,however,areinadequatetomeetsuchrequire mentsbecauseofhighdiskaccessoverheadsfordataretrie…  相似文献   

9.
1 Introduction Thefundamentalphysicalmetallurgyofthermomechanicalprocessing(TMP)hasbecomemuchbetterunderstoodoverthelasttwodecades[1~8].ItiswellcommonlyrecognizedthattheminuteadditionofstrongcarbonitrideornitrideformingelementssuchasNb,TiandVtakesveryimp…  相似文献   

10.
1 Introduction Longrangeorderedintermetallicspossessanumberofadvantages ,suchaslowdensity ,goodhigh tem peraturestrength ,excellentoxidationresistance ,whichmakeitpossibleforthemtobeusedasstruc turalmaterialsforhightemperatureapplications .However ,mostofthe…  相似文献   

11.
AComparativeStudyofSomeCommonEnglishandChineseMetaphorsGuoHongyiIntroductionItisgenerallybelievedthatOrientalcultures,suchasC...  相似文献   

12.
1 .Introduction :Languagelearnersusuallyhavedifficultyintheareaofpragmatics.‘Learnersshowsignificantdif ferencesfromnativespeakersintheexecutionofcer tainspeechacts...’ (Bardovi -Harlig,1 996 ) .Pragmaticsseemstobeanimportantareainforeignlanguagelearning .Chinese…  相似文献   

13.
1 Introduction Variationalinequalitytheoryhasbecomeaveryef fectiveandpowerfultoolforstudyingawiderangeofproblemsarisinginpureandappliedsciencessuchasdifferentialequations ,contactproblemsinelasticity ,controlproblems,generalequilibrium problemsineconomic…  相似文献   

14.
IntroductionResearchesdoneintheareaofspeechacttheorybylinguistsJ.AustinandJ .Searlehavethrownlightonthedevelopmentandformationofcommunicativecompetenceintheteachingofsecondorforeignlanguages.Theirfindingsindicatethatafluentuserofaforeignlanguageshouldn…  相似文献   

15.
INTRODUCTIONSinceitsclinicalintroduction ,extracorporealshockwavelithotripsy(ESWL)hasmaintainedanimportantroleinthemanagementofurinarycalculi.Thesuccessofthistherapeuticproce duredependsontheeffectivedisintegrationandevacuationofstonedebris.However,thest…  相似文献   

16.
INTRODUCTIONEmergencyservices,suchasemergencyin ventorysupply ,emergencymedicalserviceandfirerescuecompriseamajorconcernofemergen cyplanners.Thestrategicproblemofwheretolocateemergencyservicesstations (depots)andthestrategicproblemofthequantityofemergen c…  相似文献   

17.
1 Introduction Anumberoffullwaveanalyseshavebeenproposedinthepasttwodecades[1~3].Theseallpredictthecharacteristicsofmicrostripantennasrigorouslyathigherfrequencies.Thespectraldomainmethodofmoments[3],usingsimplebasisfunctionsrequiresalargesizematrixsuchas(…  相似文献   

18.
INTRODUCTIONMovingjetcontainingsuspensionsincludingcoalpowder,dropletsandsoonwidelyexistsintechnicalapplicationssuchasaircraftusingfuelforpower.LinJianzhongetal.( 2 0 0 0 )whosestudyshowedthattheerosionofwallsofadevicevarieswiththechangeofthecoherentstructu…  相似文献   

19.
1 Introduction UltrafineparticlesofmagneticmaterialssuchasFe,Co,Niandtheiralloyshavethepotentialapplicationsinmagneticrecording,ferrofluids,medicaldiagnosticetc..Themagneticpropertiesoffineparticlesdiffermagnificentlyfromthoseoflargeparticles,andtherelat…  相似文献   

20.
1 Introduction Becauseofthecombinationofanumberoffavorableproperties,suchashighhardness,highcarriermobilityandbreakdownvoltage,largebandgap ,lowdielectricconstant,andtransparencytovisiblelight,IRlightandmicrowaves,etc.[1] ,diamondfilmhasbeenconsider ablyprom…  相似文献   

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